Not directly competing with Helm, but we at Hoppy Network provide a static IP over WireGuard. It came out of a desire for "truly private email". We provide:
Clean IPv4 + IPv6 address, Reverse DNS, unblocked ports, unfiltered ICMP
It's priced reasonably to keep bad actors out:
We have a $60/year plan in the works, which will be available before the end of this year.